Duplex grip tool



oct. 6, 1.931. 0, Q BLAKESLEE 1,826,045

DUPLEX GRIP TOOL Filed Sept. 30, 1929 l un" 0. C. .Blakesce @www Fatentecl Oct. 6, 193

' UNITED STATES;

ill

PATENT' DUPLEX GRIP TOOL Application filed September 30, 1929. Serial No. 396,060.

My invention relates to improvements in chain tongs, and more particularly in those tongs which are adapted for special use in connection with pipes, such, for example, as those used in oil well practice, although 1n its broader aspects is not to be limited in use to said pipes.

It accordingly is an object of my invention to provide a novel form of duplex tongs in which an operating member, in the form of a lever or handle, has associated therewith a chainadapted to grip the work, at least one of the links of said chain functioning as an anchoring means, said link, on opposite edges thereof, being provided with a tooth or biting key, and preferably removable from said link, so said keys may be replaced when worn, a swinging arm, of duplex form being also provided, and preferably pivoted at its midpoint to said operating member.

The above and further objects and advantages of my invention, as will hereinafter more fully appear, I attain by the construction described in the specification, and illustrated on the drawings, forming a part of my application.

Reference is had to the accompanying drawings, in which similar reference characters denote similar parts. In the drawings,

Fig. l is a top plan view of the tongs partly gripping a pipe, shown in section,

Fig. 2 is a side elevational view of Fig. 1,

Fig. 3 is a view similar to Fig. 2 but taken on the opposite side of Fig. l,

Fig. 4 is a sectional detail view of the twin chain guide and lock devices, but showing a slightly modified mounting on the operating member or lever,

' Fig. 5 is a somewhat enlarged, fragmentary detail sectional view, illustrating the chain link guiding and locking means associated with the chain guiding and locking member,

Fig. 6 is a top plan view of one of the channeled twin elements of the chain guiding and locking member,

Fig. 7 is a bottom plan view of Fig. 6, and

Fig. 8 is a view similar to Fig. l, but showing all of the parts of the tongs in engagement with` the pipe so the latter may be turned.

Describing my invention more in detail, in its broader aspects said invention comprises an operating member, handle or lever, having associated therewith a chain adapted to embrace and grip the work, said chain having an anchoring means, forming one of the links of said chain, adapted to hold the work, said K Y erably bifurcated as at 4 to receive the end t link 6 of the chain 8, which is pivoted thereto by the'pivot pin or bolt l0, the various links of said chain being pivoted together by the pins 12 One of the links 14 of the chain 8 comprises an anchoring link and is of substantial thickness relative to the remaining links of said chain, said anchoring link functioning as an anchoring aw to engage the pipe or device i6 to be embraced or clasped, one of the links, such as the link 6, being adapted at all times holding the bifurcated end portion of the operating member 2 away from said pipe or device so that the latter will not be damaged when the tongs are used, and on each side of said anchoring link (Fig. vl) is preferably detachably positioned an anchoring tooth or biting key 18, so as to engage the pipe no inatter which way the chain 8 is swung, forming a quick and easy manner of operating the ton s.

lounted on the operative end of the operating member 2 is a swinging arm, preferably pivoted at its mid-point to said member, designated generally by the numeral 20, which may be pivoted to said member by any preferred means, such as the throughbolt 22 (Figs. l, 2 vand 3) or the threaded projections 22 on the bifurcated end portion 4 4), suitable nuts 24 being used to secure said devices in place on said member, said boltsor ly assuming the position r(Llepicted in Fig. l.,

the tooth or key 1S engaging said' pipe, and the lilik 6 holding the end portion Zleaway so no damage will' be done to saidk pipe.,`

The chain is now pulled forwardly, cans-f in g the pintles 120i the links S to engage the projections 3() of' the swinging arm 20, which moves said member Q() toward the pipe 16 until it engages said pipe, the parts assuming y the position shown in Fig. 8, the particular chain pintle l2, afterH said chain has been drawn tant, engaging the upper and lower portions 32. and being locked therein, as seen in Fig. This provides a very effective eircuinterential grip on the pipe 16, movement of the hand lever 2 causing the parts totigliten said grip as said lever' is moved. A reverse movement of the lever 2 permits the removal ot' the chain S. The simplicity, effectiveness and ease ot operation of the tongs should be clear.

While I have thus described my invention with great particularity, it will be clear that the same may be modified throughout a wide range. I accordingly do notpropose to be limited to the exact details of construction or method of application shown and described, but reserve the right in practice to make any and all modifications thereof that fall within the scope of the appended claims.

I claim as my invention l. A duplex tool comprising an operating member, a link chain connected to said ineinber, one of said links being of substantially greater thickness than the others, removable and replaceable means on both edges of said link for holding the work, and a swinging arm, pivoted at its midpoint to said member, and providing means to lock said chain and to engage and guide said chain to locking position on both sides ot said arm.

Q. A duplex tool comprising an operating lever, a link chain connected to said lever, one et said links being adapted at all times to hold said lever away from the work, a biting key on each edge of another of said links for holding the work, and a swinging arm associated with said lever, and providing means to lock said chain andl to engage and guide said chain to locking positions on either side of said arm.

3. A chain tongs comprising an operating rinember, a chain associated` with. said mem-y ber, ay grip link associated with saidk chain, and aswingingarin providing means to lock the chain and toengagc and guide the chain te locking yposition associated with said membei',y said means comprising a pair of twin elements pivoted to said member, ystifening flanges onreach of said elements, and arcuate projections on the inner side ofsaid elements,

said'arcuateprojections being adapted to Coact with said means to lock said chain.

ln testimony whereof I' have signed' my naine to this specification.

omini c. BLAKnsLEn. 

